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what is this.. behind bumper in car body
Posted: Thu Feb 23, 2023 5:35 pm
by grazuncle2
Hi all
I'm looking to wire up my after market reversing camera feed from between the bumper's number plate lights into the boot... this is a close enough area and could go through this (see photo of body work behind the bumper).. I thought it was going to be soft rubber but it isn't.. and it is a tight fit. There is a slightly smaller version on the reverse of it inside the boot/hatch.

- grommet.jpg (196.66 KiB) Viewed 1302 times
there is an oblong air vent?... next to it on the right in photo..
Thanks for you observations.
Re: what is this.. behind bumper in car body
Posted: Fri Feb 24, 2023 10:06 am
by SRGTD
I found a YouTube video showing how to remove the rear bumper from a 2019 AW model Polo. In the video, there’s a different shaped rubber grommet / plug with wiring passing through it in the location of your hard circular blanking grommet. I’ve no idea what the wiring’s for in the video or if it’s a factory or an aftermarket installation - it runs down to the bottom right rear corner of the car. You can see it at 8 min 20 sec in the video and again from around 8 min 40 sec to the end of the video.
Link to video;
https://www.youtube.com/watch?v=A4ZLXT_cCk0
As for the vent; I initially thought it was an air pressure equalisation vent to release air from the boot when closing the tailgate so you don’t have to use excessive force when closing it. I’m not sure it is though, as the air pressure equalisation vents on VW’s are normally located behind the rear wheels at the bottom of the rear quarter panel - that’s where they are on the Polo and you can see the left hand vertically oriented rectangular vent from around 8 min into the video, below the rear light cluster and behind the rear wheel.
Re: what is this.. behind bumper in car body
Posted: Fri Feb 24, 2023 10:51 am
by grazuncle2
This is great information (and link)
Thank you for posting it @SRGTD
I'll take a look right now.
Re: what is this.. behind bumper in car body
Posted: Fri Feb 24, 2023 12:29 pm
by grazuncle2
Best view I have come across so far in my search.. Thanks SGRTD
There is definitely something wired through that grommet on that Polo in the linked video

- vent and wiring2.jpg (106.63 KiB) Viewed 1177 times
it is blank/unused on mine fortunately. I think I can do something with that method of entry into the boot space and seal it afterwards. If I could discern how to separate the two parts (inside and out) I'd be happier than drilling in situ.
Thanks
Re: what is this.. behind bumper in car body
Posted: Sun Feb 26, 2023 9:15 pm
by MarcoPolo20
I think this is possibly used for the tow bar wiring loom.
Re: what is this.. behind bumper in car body
Posted: Sun Feb 26, 2023 9:51 pm
by grazuncle2
Makes sense
